Patent GB-715985-A (GB)
Title: Improvements in or relating to telecommunication exchanges
Inventor: HARTLEY GEORGE CLIFFORD
IPC: H04M15/04
Filed: 1952-04-08
Abstract: 715,985. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. March 13, 1953 [April 8, 1952], No. 8939/52. Class 40 (4) A fee to be recorded is indicated by one of a plurality of signals applied to the calling line, the fee is detected by electronic means and the calling line is identified by electronic means, both said means controlling recording means common to a plurality of lines to make a permanent record of the identity of the calling line and the fee denoted by the signal. First embodiment. In a time interval T, metering pulses M1, M2, M3, M4, for different fees may be of the type shown in Fig. 2A or Fig 2B, and when applied to the P wire, Fig. 3, fire gas tube A alone; A and B; A and C; or A, B and C, respectively. Tube A fires start tube ST1, Fig. 4, to operate group relay 1G of the appropriate finder control circuit, operation of one start tube preventing operation of any other so that ST1 prevents operation of ST2 and relay 2G (neither shown), corresponding to the set of 100 lines associated with banks m4-m6. 1G energizes an associated auxiliary relay 1GA in a set of relays 1GA-5GB arranged so that only the wipers associated with the banks m1-m3 in the one finder can be connected to tubes CB, CC, CT, in the printer control circuit. 1GA operates magnet M to drive the finder switch until the potential on the cathode of tube A of the calling line is applied to tube CT to operate T, which stops the finder switch and energizes TR. If one or both of tubes B, C are fired then one or both of tubes CB, CC also fire to operate one or both of MB, MC. TR also operates TS so that tube TX fires after a short delay to operate TT, which extinguishes ST1, CT, A, B, C, and releases 1G, 1GA, TR, T. TT and TS operate the appropriate fee magnets F1-F4 and digit magnets T1-T8, H1-H8, D1-D8, U1-U8 to print or punch the fee charge and identity of the calling line in binary code. Release of TR restores TS, TR and TS restoring the apparatus to normal. Second embodiment.The P wires of a group of 100 lines are connected through individual delay networks R1, C1 to a common terminal LT and each receives a timed impulse LP11- LPOO within and between the time intervals of repeated J pulses, Fig. 9, metering pulses M1-M4 being spaced in the manner shown in an interval T corresponding to four J pulses. When the line 54 shown in Fig. 7A receives a metering pulse on the P wire the scanning pulse LP54 coincident with the metering pulse renders tube VT conducting to pulse four fee tubes VM1-VM4 and two sets of 100 line tubes VL11-VL00, that set shown belonging to a first storagecircuit and receiving potential from tube V1 which is conducting, whereas the other set of line tubes (not shown) does not receive potential from tube V2 which is not conducting. The appropriate fee tube and line tube VL54 are thus fired. VL54 feeds a negative pulse to the cathode of V2 which fires to cut off, VI, so that the next metering condition is stored on the second storage circuit (not shown). If a metering pulse of the same kind is reapplied to line 54 the appropriate tubes in the second storage circuit are prevented from firing by couplings. to the corresponding tubes in the first storage circuit. The negative pulse from VL54 also fires VT1 to mark wire TA connecting the first storage circuit to a counter and printer circuit, Fig. 8. A ring counter VA-VN is continuously operated by pulses PR and when VA, corresponding to the first storage circuit, fires the potential on wire TA fires IVS so that the next PS pulse, shown in relationship to the J and LP pulses in Fig. 9, fires IVP. IVS also operates ISR to step the ring counter. IVP operates IPR to energize the appropriate thousands and hundreds relays MR, CR. IPR also energizes RA and short-circuits the anode-resistances of the fee and line storage tubes whereby those tubes that are conducting pulse corresponding tubes in the sets VF1- VF4, VD1-VD8, VU1-VU8 to operate the appropriate fee magnet or magnets F1-F4 and tens and units magnets D1-D8, U1-U8. These tubes also operate corresponding relays which close a chain circuit to operate release relay ZR so that the circuit is restored to normal and the ring counter resumes its scanning action.